Typewriting machine



Aug. 31, 1943.

w. A. DOB SON TYPEWRITING MACHINE Filed Jan. 27, 1941 8 Sheets-Sheetl Mm! 4. 'aaasav BY 4,

ATTOQNEY Aug. 31, 1943. w. A. DOBSON TYPEWRITING MACHINE Filed Jan. 2'7, 1941 8 Sheets-Sheet 2 INVENTOQ Mil/19 4 00850 BY H it. I I a I ATTORNEY Aug. 31, 1943. w. A. DOBSQN TYPEWRITING MACHINE 8 Sheets-Sheet 3 Filed Jan. 27, 1941 mvsurbz M44764! 19. 006500 ATTORNEY A. DOBSON 2,328,377

TYPEWRITING MACHI NE Filed Jan. 27, 1941 8 Sheets-Sheet 4 INVENTOR 17/11/94! 5 004550 I 4 ATTORNEY Aug. 31, 1943. w. A. DOBSON 2,328,377 TYPEWRITING MACHINE Filed Jan. 27, 1941 8 Sheets-Sheet 6 INVENTQR' Mil/94! ,9. mesa/V 12 F E M ATTORNEY W. A. DOBSON TYPEWRITING MACHINE Filed Jan. 27, 1941 8 Sheets-Sheet '7 lUHI nun llll llllllllll R m N0. R E. 0 v& w m A m I M Y B.

Aug. 31, 1943. w. A. DoBsoN 2,328,377

TYPEWRITING MACHINE Filed Jan. 2'7, 1.941 I 8 Sheets-Sheet 8 25" 25" llllllll ii a; /75 u /@2 INVENTOVR Mil/44f r2 00550 ATTORNEY "range. i v I Another object resides in providing amargint Patented Aug. 31, 1943 UNITED:-

STATES PAT EN OFFICE 7 'IYP EWR1TING William A: Bbbsoni wethersfieidt Gonna, assig'non to Underwood Elliott Fisher Gom'pany, New

YorkcNeYga corporation of Delaware Application. January 27, 1941; Selial'N'o. 376,046

s ciaamst (omen-63 mal line-typing. limits for typing i n either margin, and adapted tO-be automatically rec'ond'itioned for the normalmargin gaging: by returning the carriage to within the normaLline-typing release mechanism adapted for automatic res toration, particularly suited for a key-settable carriage stopmechanism having atsingle series of identical stops in a continuous; array throughout the range of carriage trayel -settahleby operation .1:

ota single key to identical-positions for cooper- {ation with a, counterstop; i

A further object is to provide a=resilient latchlatch the counterstop with a. snap action in retracted: positionin which the margin" stops-1 are freed for further carriage travel beyend' the margin-deflningpositionsythe latching device; being I adapted tobe releasednupon return: ofthe car- 3' riage'to within the normalliner-typingr rangeby engagement-of th traveling carriage stops thcrewith, to? automatically restorethe counterstopfto its.- normal margin-gaging? position. i

other objects and advantagesot the invention wiil hereinafterappear. g 'l hezinvention'is illustrated and descr-ibedherein: in conjunction" with a combined margin-gaging and tabulator mechanismformin g the subiect matter: of my" copending application Serial;

N01 372,622,filedDecember'31L 1940: Reference is also made to my copending applicatiomfierial no. 376,045, filed January 2m? 1941 inwwhichi the mechanism for selectively adaptingJa setstop for either rightor left-hand marginzagingi by tappropriate movement of theicarriage is: described and claimedi As aforeindicated; the subject mah ter' ofthe present application'- embraces: the features of the invention by which the carriage may be released iorjty'pi'ng beyond eithermargihimthedrawings: 1 w Figure 1 is a perspective view illustrating the combined margin-gaging and tabulat'o'r mechanism orthe invention; a

Figure 2 is aviews'imilar'to Figure 1 but iliis trating' only that portion of the mech'anism includin'g mainly theeounterstops; stopQrestorer anmstop setter. i a figure3is*atransverse sectional' view 't'hrough the. mechanism shown" in; Figure 1, taken on a fore-and-aft' plane of'the typewriters ing device in associationwith a retractable counterstop of a margin-stop mechanism, adapted to 3.

Figure 4 is. an enlarged front; elevation of the margin-gaging mechanism, omitting other asst)- ciatedjnec'hanisms to facilitate illus'tratiom Figure. 5 1s" a transversese'ctional view ofthe margin-gagingmechanism; taken onf a line 5-4 of Figure 4.-

Figure 6 is an enlarged front eievatio'nal view of the tabulator mechanism, showing also-the stop setter and restorer" elements; with associated mechanisms omitted" to facilitate; iilustrati'on'. v v Figure "7 is a transverse sectionaiflvi'ew through theltabulator mechanismtakerr on' the staggered line 1-1 of Figure 6'; but-omittingthe stopse'tter. 8 is a fragmentary elevation'al' vieW illustrating' the stop-setting mechanisin in" opera;- tionto-seta margin-gaging stepa Figure 9'is a fragmentaryelevational view i1 lustrating the stop-setting mechanism operated to set a stopr for tabulating ,Flgureslll and 11' are'views supplementing'Figure'ashcwm thetwo positions of a'set stop rel'a tivelyl' to. the" margin" 'count'erstop; upon movement of the. carriage in each-direction; subsequent to stofpsettingt.

Figures 12 and 13 are" eleven-one views relatingf respectively tc-Figures liland 11- andillustrati'ng the coaction of the rig-ht and 1m margin=gaging"stops with" the margin coimter'st'op in" eacfi dii-ection or} carriage movement.--

le -illustrates the operation of the stoprestoring mechanism to restore a seriesof stops Set tabulating, during a carriage pin- Figures 15 and lfi' supplement. Eigure 14!, Figwere showe s margin-gagihe stop abutting; the

y stopwestorea without disturbing the former, during ag-eemage to: restbreitlreP tabulator :st'ops,

and Figure 1 '6 shoWs the stop restore! in readiing the" m-argin release mechanism operated. to

allow for; typing beyond a margin and show; in Figure 17, the mechanism in; initially operated position after depressingl'the'margirn release key, and-in Figure lili-therfinal'\positiom'or the mechanism afterrelase ot said key.

Figure 19 shows the mafgini 'relea-se mechanism in the initial stage of restoring the counters'top for its normaTm'argin-gaging function,

V after typin'gbeyond ther-ightdnavgin'a Figure zc is a view similar to mgure I9 but illustrating" theinitial stage of restoring the c ounterstop' and afiter typing beyond. the; left margin; Figure- 21* illustrates" the tabula-tor mechanism operated to institute a carriage run withiatset tahula'torstop approaenmgqengagement with the ra sedtabmater' ountetsten: Y

Figure 22 is a plan view of the letter-feed escapement mechanism, also showing portions of the mechanisms for line locking and carriage release, and,

Figure 23 is a fragmentary front elevation of the escapement mechanism.

Referring now more particularly to Figure 3 of the drawings, a carriage I includes spaced end members I I that are rigidly connected by a carriage bar [2. A platen cylinder l3 extends par- T allel to the carriage bar l2 and is rotatably mounted in the end members I l. The carriage is guided for line typing and return movement on trackways M supported on the main frame it of the machine. A spring drum [6 moves the i carriage in letter-feed direction under control I of a letter-feed'escapement mechanism ll which includes a rocker l8 carrying dogs which cooperate with an escapement wheel Hi. The escapement mechanism is carried on a bracket plate 29 extending across the machine and supported on the main frame l thereof. The escapement wheel i9 is geared to a rack 2! on the carriage by a pinion 2E. The typing instrumentalities may be of any known kind and may include type bars 23 that are movable against the platen It by type keys in the usual manner. The escapement is operated by engagement of the type'bars 23 with a universal bar 24 to rock the dog rocker l8 on its pivot 22 at the actuation of the type keys, in the well-known manner. In consequence of each type key operation, the carriage is advanced step by step at letter spaces to type the characters along a typing line. a I

Carriage stop rack:

The stop rack organization illustratedforms the subject matter of my copending application,

Serial No. 369,467, filed December 10, 1940, now

Patent No. 2,317,183, issued April 20, 1943. Brief- 1y, thi organization includes a series of letter spaced, key-settable stops 25 slidably supported on a rack bar 26 mounted on the carriage end members H. A detent spring 21 extending along the rack bar, coacts with-each of the stops to yieldably hold same at retracted, ineffective position, or at either of two effective positions, each stop having a series of detent notches defining said positions. I

The lower end of each stop 25 presents two laterally related tabs 28, 29 offset vertically from each other. As shown more clearly in Figure 1, these tabs are each adapted to engage with certain counterstops when set to certain positions. When a stop 25 is lowered the full extent or two notches, the stop is set for margin gaging, the tab 29 being disposed to engage a margin counterstop 30 during carriage travel. When the stop 25 is lowered half way or one notch, it is set to define a tabulator station, the tab 28 thereof being adapted to engage a tabulator counterstop 31 when the latter is raised from ineffective position during a tabulating operation.

, Stop setting The stop-setting mechanism includes a stop setter 33 mounted for vertical movement and carrying a finger 34 at its upper end, arranged to overlie the series of'stops 25, this finger being adapted to engage any one of said stops positioned thereat in accordance with the position of the carriage at the moment of stop setting. The

' lower end of the stop setter 33 is flexibly connected to an arm 35 fixed on a rock shaft 36 ournaled in brackets Bl of a back plate 38. A lever stem 4'18 pivoted at 9 on the lever arm M adja cent the forward end thereof. The key stem 48 projects downwardly and provides a gaging stop 53 at its lower end adapted to engage a member 5| of the machine frame. The key stem 43 includes two laterally projecting lugs 52, 53 on opposite sides of the stem pivot 49 and adapted to engage different portions of the lever arm 44. A spring 54, connected between thestem it and arm 44, yieldably holds the key stem in normal, upright position defined by the engagement of lug 52 with the arm M. In saidposition, the gaging stop 5!] comes into engagement with the member 55 when the stop-setting key M is pressed directly downward. By such operation, the stop setter is drawn downwardly only half of its full extent of movement, thereby setting the stop '25 for tabulating, all as shown in Figure 9. To set a stop 25 for margin gaging, the key A! is pressed downwardly and also urged forwardly against the tension of spring 54 until lug 53 engages the lever arm 44 thereby moving the gaging stop so to a position clear of the mem er 51. By operating the stop-setting key 41 in this manner, as illustrated in Figure 8, the stop setter 3-3 is lowered to the full extent determined by engagement of lever arm 44 with the member 5| and thus moves a stop 25* a corresponding degree, setting same for margin gaging.

Stop restoring ber 6i, restores the mechanism to normal position, with the stop-restorer 51 retracted. The upper end of the stop restorer 51 carries a projecting portion 68 presenting an inclined face 69 and a horizontal face Hi, the face 69 rising in carriage-return direction. i

The operation of the stop-restoring mechanism to restore any set tabulating' or margin-gaging stop individually, or restore all of the tabular stops during a carriage run, is illustrated in Figures 14 to 16. To concomitantly restore all of the set tabulator stops, the carriage is brought to line-end position, as bybanking against the right-hand margin; stop. The restorer button 64 .is then pressed and held down while the carriage is actuated through a return movement. As shown in Figure 14, each tabulator stop comes into engagementwith the inclined' face 59 on the stop restorer and iscammed upwardly .thereby into its ineffective position on the stop rack. The restoration ofany set stop individually, whether for tabulating or margin gaging, may be effected by first banking the carriage at the position of the stop to be restored.

tabs 29 thereof.

assets?? Sal'dstop' isthus positionededi'rectly overthehbrldirection of carriagemovement followingthe inargin stop setting operatlon; Ih other words; after set-ting any one of" thestops 26 for margin gaging, the c'am'iage'may be-;moved to the left; putting the set stop at the left of the margin counterst'op 303! so that said step will thereafter determine the beginning-of li'ne position of the carriage; Inversely; when" thecarriage is moved to the right after stop setting;- the setistop is positioned on therightside of the counterstop 3Q for determining the line-end-position of the carriage As shown more olearly in Figures fi, 4, and 5, the ma-rgincounterstop: 30 is mounted for up and down and: lateral movement. slot- 17. ad

ja'cent the :lowenend of the/oounterst'op rides on a stud l3 carried: on the plate: 38; m spring-14 yieldably holds: the? counterstop in: normal, raised position; determinedz by engagement .of the' end of slot-p121 with. the Stud: 13; ln said raisediposttion; a projection 150m the'oounterstop 3!! is in the path of the margini-set stops to intercept the The: countersto may: oscillate about the stud' 13 laterally, that is, in the plane of carriageg movement, between certain limits it whichgdetermine two efiectivepositions; of the counterstop illustrated. respectively; in:;Figures1 12 and: 13; myokeelike bracket 16; secured at: each end to the=p1at'e:38; straddlesithe counterstop 30 andother elements associated: therewith, and

has; two bent-oihlugs 1V1, 18v adapted L to be en:-

gagedby the sides of the counterstop'w when the latter is swung to either of said positions. The spring 14, acting on an oiT-set arm 19 of "the counterstop 30, exerts its-force; in such direction as to hold: the counterston in normal, upright position against the lug 11,:see-Figure 13, I in which position the counterstop remains-- when arresting the carriage in rightward: travel,- at

the beginning of aitypingline. 1 In arrestingthe carriage in linen-end position, the margin-gaging stop, being intercepted by the counterstop 30, causes the counterstop toiswingagainstthe-lug 18. Thisswinging 'movementis employed to operate a line-lock device-hereinafter described, but is primarily intended to assure: a; correspondingarrest position of the margin-gaging stop whether functioning forleit or right;

margin gaging; In" other words; thezrightehan'd margin stop 25, Figure: 12,; andm-thenleft hand marginstop; Figure 8, assume oorrespondingipoisitions laterall'y of thetmachine whenrjthe:car-

riage is: arrested at either margin. It "will be observed by a comparison of FigureslBr and 8 that, in itsactualtyping position; Figure? 8; the

carriage has droppedbach a fractional letter space from the position of stop: interception,

Figure 13. This drop-back.- isusua-l inmazgin stop mechanisms, being: requirecli to allow the letter-feed mechanism; to assume control of the carriageafte'r thgcarriajge stop-has engaged the counterstope -Dete1mihation of the extent of the. counterstop; swinging-r movement intoaccount the actual thickness-of a stop ZS -and the counterstop; making allowance for the menti oned drop-baeli ofthecarri'age; and is adequate to arrest the carriagewith I the right-hand stop at the same pesition talie'zr by the left hand stop" after-the ietter reed mechanismhas assumedcontrol of the carriage; as shown ih l igure 8; This position, hereinafter referredrtw as the Stop Stettibm" is -tha/ii at the stop sttiiig finger and the step restore: f'aioe 1i) are-also disposed;so-as to set 'or iestoreanystombrought to -tlia=t stati0n bycanrih'ga movement; i

As aforeindicated, meanssieprovi'dedtby which .a set margin stopmay assume its effective position at either side of the margin counterstop 30. A- buttress 8!! is* ivotally mounte'ci on the counterstop an'd is arranged to overlap thaprojeet'ioii 75" thereof and extends to: the left beyond said projection into the mentlbned st-olp statiom with the counterstbp 3m in its normal; position; see l 'l'gure li The top edgeof the buttfress is arouateoma radius fiom its plvoix centbn so a's to clean thestbpeack ban ifi i'n alii angular positions and' is positioned 'just-above the'itop ofthe countemp projection 13. The-buttress 80i'is;yie1d'- ahly helu' i'n nonnalipositionzby a spring; 81 interposed between: a lowen arm on the: buttress: and the: countemtopg at which: position, a; Ingram on the buttress: engages an: inncn'edge off the. noun;- torstopi i t The? function; and: operation; on thgzibuttmss B0? in setting; theistops" for; margin gagihgt is il'- lustratedfiniFigmzesfi, 1 0 and. 1:1; to Atath'e moment ofzf settingz'aa stop; i the: marginsrcounterstops Wis i in it's normal-,1 rightwardz positibn; and; their buttress innit-s; normal; leftwardr position, projeeting iHtOifthBT stow station Asnthestop-setting iszoperatedg, aswsh'own inxliig ureu 8, to

set a stop for margin: gaging-,1 thelstop=-beingilowered engages the buttressiifl. and. the counterstop 30 is thus ret'ract'edt'o tlie'position shown in fuil ilineaagainstit-hwtensiomoffspring. 14". If" the setistop: is intended-iron rightehan-d' margin gage ing; the oamagais movewtos the-wright andi the i set; stop; riding alongithetopsedgefof "the? buttress or; s'wirxgi'ng xt h'zp buttress with; it;. travels: to. the

V right-aside 0t the-projection: 7 5 in iwhichaposition the: counterstopi is'releassedl to assume? its normal positiom underinfiuence of spring 14: when: it

is! intendech that, thesetstop: function to gage the :left margin, thecarriage is: movedi torthe left Iaften setting-:the stop-, and the" counterstop is released; to: normal,

position Withthe-stop to the-rleft0f the-projectionflfi. 'I hezbuttress 80 is? pit otally mountedin order; thatsamenma-y swing outpof the-way when: the mechanism-functions toeeae a left-hamt mangin see. Fiigure' 1 3,

so that the left-hand stop may directly engage.

themargin-oounterstop. Eor right-hand marttion thebuttress-withit; swings toithelpositionlshown v in Figure: 12.: By this procedure; aasizo rfi is gin gaging, thewbuttress remains inlnormal posiwhile the margin counterstep 30,, carrying set fonmarginzgaging adjacent each end of the 651i earriagaand. defines aline-typing Z0116. between these stops, into( which zone the" counterstop 3 0 .1 projects foninterception of: the margin-gaging stopsJF movingtwithmthev carriage in either direction.

Line-ndsignal atypihgziine endiisisiiowminvmgure h A? lever 84 pivoted onnasmdiwoarries aahanuner w'adapted tolstnike when-2m: Ani azm of the lever piilotally m ci imssmtvipper do; wweightemtomonnaliy rest Thei meohenism -fon"signallingrt he"approach ofto strike the bell under influence of spring 90. 2

During carriage return,the dog 88 is swung clockwise by the passing margin stop 25*, while the lever 84 remains inactive.

Linc locking The mechanism for locking the machine at the end of a type line is shown best in Figures 3, 4 and 22. As previously described, the counterstop 30 is swung to the position shown in Figure 121 when the carriage is arrested at the typing line end, which movement operates the line-lock mechanism. A lever 93, Figure 3, is pivoted at 94 on the bracket plate 20 and has a yieldable end portion or sprin 95 engaging the left side of the counterstop 30, see Figure 22. Lever 93 reaches through an aperture in the plate 20 and carries a lug 96. During line typing,the dog rocker I8 is oscillated on its pivot 22 for the letter-feed control of the carriage. The counterstop 30,

being in its normal upright position, Figure 13, leaves the lever 93 in normal, inefiective position at which lug 96 is free of the dog rocker I8, the lever 93 being restored to normal position by a spring 91. As the counterstop 30 is swung to the Figure 12 position, lever 93 is actuated and the lug 90 thereof is brought to'position to obstruct the dog rocker, thereby holding the universal bar 24 immovable and preventing the type bars 23 from completing a typing stroke. I

Margin release vWhen it is desired to type beyond either margin, a margin-release button 08 is depressed, which retracts the margin counterstop 30 from thepath of the margin stop 25 to permit pas- ,4.

sage of the latterto the opposite side of the counterstop. As shown in Figures 1 and 3, a push rod 99 issuing from the release button 98 is flex:- ibly connected to an arm I00 of a rockable member I0! .rotatably mounted by trunnions journaled on the main frame and a bracket hanging from the plate 20, Figure 3. A second arm I02 of the rockable member is loosely engaged at its free end in a slotted ear I03 at the lower'end of the margin counterstop. As the button 98 is-- pressed, the arm I02 swings downwardly, thus retracting the counterstop from efiective position. I

Mechanism is provided for holding the counterstop retracted'during margin typing, and for all,

tomatically releasing the counterstop when the carriage is restored tothe line-typing zone.- A resilient latch member I05, preferably in the form of a fiat spring, is mounted for pivotal and endwise movement by a headed stud I00 secured to the latch member and engaged in a vertically elongate slot I01 in the bracket I0. A tension spring I08 yieldably holds the latch member down, with the stud I00 bottoming in the slot. The spring I08 is arranged to exert its force on the latch I05 in a substantially perpendicular line from the center of stud I00 so as to yieldably hold the latch in a normally upright position, see Fi ure The lower end of the latch I05 is bent at .an ang1e inclining toward the counterstop 0 to;

aseaew provide a bevel I09. As the counterstop is retracted, at catch H0 thereon, Figure 5, cooperating with the bevel I00 flexes the latch I05 outwardly until the catch H0 is engaged under the bottom end of the latch. This condition of the mechanism is illustrated in Figure 17 and is a result of pressing the release button 08, before releasing same, and may follow from either condition of the; stop mechanism shown in Figures 12 and 13. From the Figure 13 position, the counterstop 30 is merely retracted until latched down, without varying from its upright position. When the counter stop 30 is positioned as at Figure 12, the line-end-defining position, the initial retrac tion of the counterstop withdraws same from the margin stop, immediately following which the counterstop assumes an upright position against the lug ll, under influence of spring '54. Further retraction of the counterstop completes the latching, as described. When latching is completed, as shown in Figure 17, the button 98 is released and the counterstop is pulled upwardly by its spring I4, carrying with it the latch I05. It may be here noted that in retracting, the counterstop islowered a distance greater than that necessary to clear the margin stop 25* and that the clearance afforded by the slot I0! approximates the additional amount the counterstop is retracted over that necessary to clear the stop. For

example, the counterstop may be lowered a distance twice that necessary to clear the stop, and the extent of rise of latch I05 afforded by slot I01 may be equal to one half the counterstop retractive stroke. When the counterstop is raised after latching, the stud. I00 engages the upper end of the slot and thus gages the position of the counterstop so that its upper end is still below the path of the carriage stops, having been raised only half its retractive stroke. The upper end of the latch I05, however, is now projecting into the carriage stop path, see Figure 18. It will be noted that the spring M is relatively stronger than spring I00 so as to overcome the tension of the latter in raising the latch I05, as described.

To complete the margin-release operation when the carriage is at line-endposition, it is only necessary to press and release the button 90, in that the counterstop, having been in the Figure 12 position, is swung by its spring 19 to 'the opposite side of the margin stop. Atthe beginning-of-line position, Figure 13, it is necessary to hold the button 98 down while the carriage is moved to its extreme rightward position, in order to get the margin stop at the opposite sideof the counterstop. This mode of operation, however, is desirable in that the car riage should be moved to its rightward limit for 1 any typing in the left-hand margin.

To restore the carriage to within the linetyping zone, the carriage is moved from either of the margin-typing positions and the stop 25* is thus carried past the retracted counterstop 90, The margin stop thus engages the upper end of the latch I85, swinging same laterally on its stud I06 until the catch I I0 is freed from the bottom end of the latch, see Figure 20. The counterstop 30 is thus released to be restored by its spring Id to its. normal, raised position in the path of the margin stops. When clear of catch M0, the latch I05, under influence of its spring 5 08, is pulled downwardly until the stud Itlfi bottoms in its slot, the spring I08 also acting to restore the latch to normal, upright position. The

Y action of the mechanism in tripping the latch is bankingthe carriage at the substantially the same whether. restoring the car- ,riage from the left or right margin-typing posij I Tabulating The carriage is tabulated to, each column position at which a stop has been set for tabulatin'g, by pressing a tabulat'or key I I2 which re leases the carriage for a tabxilating run and ral'sesthe tabulator counterstop 3| to effective position in the path of the carriage stops. As

shownin Figure 1, the key H2 is carried on a I lever II3 pivotedat l3 and connected by a link IIl to an arm II5 oi a rockable member H6 rotatable on the shaft 36. A spring" III acting on the member IIG restores the mechanism to 'normalposition at whichlever I13 engages the fixed member 46, see Figure 21. A second arm I ll on the member I IBproiects through an openhis in-the plate 38 and carries a cam "I20 cooperback of plate 38, Figures 6' and 7. A forked portion of thebell crank cooperate's'with a roller.

5 by spring I25, thus releasing the brake mechanisi'rnand at the sametimfe restoring the carriage to the control of the letterffeed inechanism by releasing theholding (16;; MI. 'The machine is thus conditioned for a succeeding tabulating cperation,lor for further line typing, asrequired. In banking the carriage at asel'ectedicolumn, the tabulator stop imparts a heavy impact to thesc'ountersto-p 3| which, in projectedtposition, is backed byfajmemberll iof the back plate, The portions: the counterstop M with which the mentor stops engage is"necessarily lot a width I to engage between two; ,adja cent set stops. I This engaging portion is, there- Ior'e, in the format athin pr'O BCtion I43 which, as shown in'li'igure '1; extends beyond'therear face: or gthelnpunterstopand, thus overlies the =I23jcarried:onthetabulatorcounterstop 3| and "projecting through an elongateslot I24 inthe plate, which slot affords a guide for the counterstop and determines its' norrnal and projected positions. The counterstop is: further guided in an up and-down direction by a sliding contact edgewisewith the stop restorer 57, with which it is in coplanar relation. A spring I25 restores the counterstop SI and bell crank I! I to normal, inactive position. I I

i counterstop 3I includes a threaded ear I28 carrying ascrew I21 from which a rod I28 "projects throughan ear I30 of a brake plunger I3I. A spring I32, backed by the screw I21 presses against the brake plunger ear I30, forming a yieldable connection between the counterstop 3| and said plunger. ,A lever I33 pivoted at I34, has one end engageable by a forked portionof the plunger I31 and carries a brake shoe I3! adapted to be brought into pressure engagement with a strap I36 securedto the stop'rack baa-I8, to retard carriage travel during the tabulating run. I, l

In the present embodiment of the invention, the carriage is releasedfor a tabulating run by withdrawing a holdingdog oi the letter-feed escapement. Asshown best in Figures 3, 22 and 23, a finger I31 projecting from the bell crank HI is engageable with aleverl33 pivoted at I39 on the plate and has a finger I40 reaching through the plate and engageable with a holding dog MI ofithe escapement, see Figures 22 and 23.

Conclusion t win-be apparent hem-the foregoing that the invention provides a' simple andreliably operativelatchingfldevice, as embodied in the resillentlatch ms, bywm'eh themargincountcrstop 88 is retainedin retracted'posltiontoallow the carriage; stops 25 to travel therebeyond, for

typing beyond either fmar gln defined byfsaid When the tabulatin'g key H2 is pressed, the

resultant leftward movement of finger l3! swings lever-I33 and thus withdraws the holding dog Ill from the ratchet wheel; thereby releasing the "carriage for a tabulating run under influence of the Spring drum '8; At the same time, the tabulating mechanism is actuated as illustrated in Figure 21; to raise the countei'stop 3| to tabulator-stop-intercepting position preparatory to column determined b the set tabulator stop an.

terstop oppositely mounted on the frame and cara In the tabulatihg run; thecarria ge is moving leftward, as indicated by the arrow, and the stop 25 is, therefore, approaching the counterstop. As the carriageis released, the raising of the counterstop fH actuates the brake niechanismfin that the resultant tional carriagetravel,

engageable and releasable by, the stop during compression of spring I32 presses the brake shoe I35 against the stop rack 26 to retard'the momentum of the carriage. Upon releaseof the tabulator key I I2, the counterstop 3| is retracted stops. fUponreturn or the carriage towithm the normal line-typing range, the carriage stops traveling therewith. conic: into engagement with theproj eotlng finger, o1 latch I05, swinging same to a position to free the counterstop which thereafter-resumes normal position in the path of the carriage stops, for gaging thenorn' al'man gins of a line ofltyping, thecounterstop thus being automatically reconditioned by merely ree tin ningtheoarriage towithin the line+typirig range; 1* "1 What is claimedisz V 1. In a typewriter having a frame anda travel: able-carriage, infco'inbination, a stop anda couriterstop oppositely mounted only the frame and carriage for relative movement during carriage travel, said counterstop being normally urged to l a positionengageable with said stop, to gage a riage for relative movement during carriage travel, said counterstop being normally urged to a positionengageable with said stop, to gage a normal line end or carriagetravel, means for retracting the 'counterstop' to clear the stop, to permit additionalj carriage travelbeyond the normal line endQ and resilient latching means yieldable in a direction transverse to the direction of carriage travel, forengaging the retracted counterstop to hold the counterstop retracted during saidaddisam latching means being subsequent carriage travel; to release the coun- 9tei stopwfor restorationto effective position.

3. In a typewriter having "a frame and a travelable carriage, in combination, a stop and a counterstop oppositely mounted on the frame andcar- I 1 riage for relative movement during carriage travel, said counterstop being normally urged to a position engageable with said stop, to gagea normal line end of carriage travel, means for retracting the counterstop to clear the stop to permit additional carriage travel beyond the normal line end, and a latching member mounted for reciprocatory movemen't in the direction of counterstop retraction and yieldably held in ineffective position out of said path,said latching member being engageable with the retracted counterstop to hold the counterstop retracted during said additional carriage travel, initial return of the counterstop toward said path being efiective to movelsaid latching member into said path, said latching member being thereby adaptedto be engaged and released by the stop during subsequent carriage travel, for release of the counterstop for restoration to effective position.

4. In a typewriter having a reciprocatory carriage, in combination, a stop on the carriage movable therewith in a path, a'counterstop retractable transversely of said path and normally urged to position in said path to gage a normal line end of carriage travel defined by said stop, means for retracting the counterstop out of saidv path to permit additional carriage travel beyond the normal line end, the extent of r'etractive movement exceeding that required to clear the stop, and a latching member mounted for reciprocatory movement into and out of 'the'stop path to an extent less than that of the counterstop retractive movement and yieldably held out of said path, said latching member being latchable with the retracted counterstop to'hold the counterst'opretracted during said additional carriage travel, initial return of the counterstop toward said path being effective to move said latching member into said path for engagement and release by the stop during subsequent carriage travel, to release the counterstop for restoration to efiective position.

I 5. In a'typewriter having a recip-rocatory carriag'e in combination, a stop on the carriage movable therewithin a path, acounterstop retractable transversely of said path and normally urged to position in said path to gage a normal line end of carriage travel defined by said stop.

means for retracting the counterstop out of said path to permit additional carriage travel beyond the normal line end, the extent of retractive movement exceeding that requiredto clear the stop, a latching member mounted for pivotal movement in the direction of carriage travel and reciprocatory movement into and out of the end of carriage travel defined by said stop, means for retracting the counterstop out of said path to permit additional carriage travel beyond the normal line end, the extent of retractive movement exceeding that required to clear the stop, a member pivoted intermediate its ends to swing in the direction of carriage travel and mounted for reciprocation into and out of the stop path to an extent less than that of the counterstop retractive movement, and a spring yieldably holding said member out of said path and in normal inactive position substantially at right angles to said path, said counterstop having a catch, said member having a part engageable with said catch to hold the counterstop retracted during said additional carriagetravel and having a finger normally out of said path and positioned therein by counterstop movement translated. to. said member during initialreturn of the counterstop toward said path, for freeing the counterstop during subsequent carriage travel.

'7. In a typewriter having a frame and a reciprocatory carriage, in combination, a series'of settable stops arranged at letter-spaced intervals on the carriage and movable therewith in a path, any two of said stops that are set bein adapted to define the normal line ends of car-- riage travel, a retractable counterstop on the frame normally urged to position in said path, means for retracting the counterstop outof said path. to permit additional carriage travel beyond the normal line ends, and a latching member pivoted on the frame to swing in either direction of carriage travel and yieldable in a direction transverse to said path to latch the counterstop retracted, said latching member being engageable by either of the set stops during subsequent carriage travel, to swing the latching stop path to an extent less than thatof the v counterstop retractive movement, and means yieldably holding said latching member out of said path andin position generally transverse.

thereto, said latching member being latchable with th'e'retracted counterstop tohold the counterstop retracted during said additional carriage travel, initial return of the counterstop toward said ,path being effective to move said latching member into said path for engagement by the stop during subsequent carriage travel, ,to swing said member free of the counterstop.

6. Ina typewriter having a reciprocatory carriage, in combination, a stop on the carriage movable. therewith in a path, a counterstop retractable transversely of the path and normally urged to position in said path to gage a normal line member and thereby release the counterstop for restoration to efiective position.

8. In a typewriter having aframe and a reciprocatory carriage, in combination, a series of settable stops arranged at letter-spaced intervals on the carriage and movable therewith in a path, any two of said stops that areset being adapted to define the normal line ends of carriage travel, a retractable counterstop mounted on the frame for reciprocation into and out of said step path, means yieldably holding the counterstop in said path, means for retracting the counterstop out of said path to permit additional carriage travel beyond the normal line ends, the extent of retractive movement exceeding that required to clear each set stop, a latching member mounted on the frame for pivotal movement in either direction of carriage travel and for reciprocatory movement into and out of said path to an extent less than that of the counterstop retractive movement, a spring yieldably holding said member out of said path and in normal inactive position substantially at right angles to said path, said latching member in its WILLIAM A. DOBSON 

